. >>> we're also learning more this evening about the fbi's move to use new science against criminals in this country. eye scans and other so-called biometrics on street corners and surveillance cameras that scan our faces as we walk by. here's reena ninan now. >> looks like we got a head. >> u.s. marshals. >> reporter: you've seen it on tv. >> facial recognition match on the father. >> reporter: and in the movies for years. now it may soon be coming to a city near you, the fbi's billion dollar project will use available surveillance cameras to scan faces and match those images against their national database of known criminals. dubbed the next generation identification program, face recognition, dna, iris scans and voice identification will make it harder for the most wanted to hide. some worry about the potential to invade privacy, others believe it's a crime-fighting tool whose time has come. >> you've got to go after them where they are and you have to go after them smart with intelligence and special operations. >> reporter: as we approach the anniversary of september 11th, a new